1 files changed, 73 insertions, 0 deletions
diff --git a/src/libfsm/switchgoto.cc b/src/libfsm/switchgoto.cc
new file mode 100644
index 00000000..3b293c70
--- /dev/null
+++ b/src/libfsm/switchgoto.cc
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2001-2018 Adrian Thurston <thurston@colm.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "switchgoto.h"
+
+void SwitchGoto::LOCATE_COND()
+{
+	if ( red->condSpaceList.length() > 0 ) {
+		std::stringstream success, error;
+
+		out <<
+			"	" << ckeys << " = " << OFFSET( ARR_REF( condKeys ), ARR_REF( transOffsets ) + "[" + trans.ref() + "]" ) << ";\n"
+			"	" << klen << " = " << CAST( "int" ) << ARR_REF( transLengths ) << "[" << trans << "];\n"
+			"	" << cond << " = " << CAST( UINT() ) << ARR_REF( transOffsets ) << "[" << trans << "];\n"
+			"\n";
+
+		out <<
+			"	" << cpc << " = 0;\n";
+		
+		if ( red->condSpaceList.length() > 0 )
+			COND_EXEC( ARR_REF( transCondSpaces ) + "[" + trans.ref() + "]" );
+		
+		success <<
+			cond << " += " << CAST( UINT() ) << "(_mid - " << ckeys << ");\n";
+
+		error <<
+			cond << " = " << errCondOffset << ";\n";
+
+		out <<
+			"	{\n"
+			"		" << INDEX( ARR_TYPE( condKeys ), "_lower" ) << " = " << ckeys << ";\n"
+			"		" << INDEX( ARR_TYPE( condKeys ), "_upper" ) << " = " << ckeys << " + " << klen << " - 1;\n"
+			"		" << INDEX( ARR_TYPE( condKeys ), "_mid" ) << ";\n"
+			"		while ( " << TRUE() << " ) {\n"
+			"			if ( _upper < _lower ) {\n"
+			"				" << error.str() << "\n"
+			"				break;\n"
+			"			}\n"
+			"\n"
+			"			_mid = _lower + ((_upper-_lower) >> 1);\n"
+			"			if ( " << cpc << " < " << CAST("int") << DEREF( ARR_REF( condKeys ), "_mid" ) << " )\n"
+			"				_upper = _mid - 1;\n"
+			"			else if ( " << cpc << " > " << CAST( "int" ) << DEREF( ARR_REF( condKeys ), "_mid" ) << " )\n"
+			"				_lower = _mid + 1;\n"
+			"			else {\n"
+			"				" << success.str() << "\n"
+			"				break;\n"
+			"			}\n"
+			"		}\n"
+			"	}\n"
+		;
+	}
+}
+